It's worth noting that a standard technique to weaken a rival group is to deter or prevent its members from cooperating — sometimes by disrupting their communications; but also by inciting rivalries or jealousies (i.e. lack of trust) within the group. We see this in everything from high-school cliques, to Internet trolling, to office politics, to counterintelligence and psyops among nation-states.

Ceteris paribus, any human social group is more effective if its members cooperate toward accomplishing its goals. Therefore a rival group which wants to prevent those goals from being accomplished can do well by disrupting the group's cooperation.